| 摘要 |
The invention relates to a driving and controlling circuit for illumination of LED. It comprises an LED load with a constant-current driving circuit, a switching power-taking unit, and a control unit, wherein one end of the switching power-taking unit is connected with one end of the LED load, and the other end of the switching power-taking unit is connected with one end of a direct-current power supply, the other end of the direct-current power supply is connected with the other end of the LED load, the power output end of the switching power-taking unit is connected with the power input end of the control unit, and the signal output end of the control unit is connected with the signal input end of the switching power-taking unit. The present invention solves the problem of that the conventional driving and controlling circuit for illumination of the LED can not be used directly on the conventional laid two-wire system illuminating line, solves the radiation problem of the LED load, controls the starting or the stopping of the LED load, carries out the PWM dimming control on the load. The use is more convenient, the LED load works reliably and stably, and the popularization of the illumination of the LED under the existing condition is promoted. |
